package com.winterchen.websocket;

import com.winterchen.utils.LogUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * @className WebSocketServer
 * @Description WebSocket服务
 * @Author Administrator
 * @Date 2018/9/13 0013 10:00
 * @Version 1.0
 **/
@ServerEndpoint("/websocket/{sid}")
@Component
public class WebSocketServer {
    private static Logger log = LogUtils.getBussinessLogger();
    //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static int onlineCount = 0;
    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<>();
    //与某个客户端的连接会话，需要通过它来给客户端发送数据  注意这里Session的导包,是WebSocket里的
    private Session session;
    //接收sid
    private String sid = "";

    /*
    * @Description: 建立成功调用的方法
    * @param
    * @Return:
    * @Author: 张峻豪
    * @Date: 2018/9/13 0013 10:10
    */
    @OnOpen
    public void onOpen(Session session, @PathParam("sid") String sid) {
        this.session = session;
        webSocketSet.add(this);  // 加入set中
        addOnlineCount(); // 在线数 + 1
        log.info("有新窗口开始监听:"+sid+",当前在线人数为" + getOnlineCount());
        this.sid=sid;
        try {
            sendMessage("连接成功");
        } catch (IOException e) {
            log.error("webSocket IO异常");
        }
    }

    /*
    * @Description: 连接关闭调用
    * @param
    * @Return:
    * @Author: 张峻豪
    * @Date: 2018/9/13 0013 10:17
    */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this); // 从set中将其删除
        subOnlineCount(); // 在线数 - 1
        log.info("有一连接关闭！当前在线人数为" + getOnlineCount());
    }


    /*
    * @Description: 收到客户端消息后调用的方法
    * @param
    * @Return:
    * @Author: 张峻豪
    * @Date: 2018/9/13 0013 10:19
    */
    @OnMessage
    public void onMessage(Session session, String msg) {
        log.info("收到来自窗口"+sid+"的信息:"+ msg);
        // 群发消息
        for(WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(msg);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /*
    * @Description: 发生错误时
    * @param
    * @Return:
    * @Author: 张峻豪
    * @Date: 2018/9/13 0013 10:23
    */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }


    /*
    * @Description: 群发自定义消息
    * @param
    * @Return:
    * @Author: 张峻豪
    * @Date: 2018/9/13 0013 10:25
    */
    public static void sendInfo(String msg,@PathParam("sid") String sid) throws IOException{
        log.info("推送消息到窗口"+sid+"，推送内容:"+ msg);
        for (WebSocketServer item : webSocketSet) {
            // sid为空时就群发
            try {
                if(StringUtils.isEmpty(sid)) {
                    item.sendMessage(msg);
                } else if(item.sid.equals(sid)){
                    item.sendMessage(msg);
                }
            } catch (IOException e) {
                continue;
            }
        }
    }





    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }



    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }
}
